/**

 * Relational pipes

 * Copyright © 2021 František Kučera (Frantovo.cz, GlobalCode.info)

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, version 3 of the License.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. If not, see <http://www.gnu.org/licenses/>.

 */

#pragma once

#include <memory>

#include <string>

#include <vector>

#include <iostream>

#include <sstream>

#include <locale>

#include <codecvt>

#include <regex>

#include <stdexcept>

#include <relpipe/reader/typedefs.h>

#include <relpipe/reader/TypeId.h>

#include <relpipe/reader/handlers/RelationalReaderStringHandler.h>

#include <relpipe/reader/handlers/AttributeMetadata.h>

#include <relpipe/writer/Factory.h>

#include <relpipe/cli/RelpipeCLIException.h>

#include "Configuration.h"

#include "Mode.h"

#include "DataMode.h"

#include "MetadataMode.h"

namespace relpipe {

namespace tr {

namespace infertypes {

using namespace std;

using namespace relpipe;

using namespace relpipe::reader;

using namespace relpipe::reader::handlers;

class InferTypesHandler : public RelationalReaderStringHandler {

private:

	shared_ptr<writer::RelationalWriter> relationalWriter;

	Configuration configuration;

	std::shared_ptr<Mode> currentMode;

	vector<writer::AttributeMetadata> toWriterMetadata(vector<AttributeMetadata> attributes) {

		// TODO: move to a reusable method (or use same metadata on both reader and writer side?)

		vector<writer::AttributeMetadata> writerMetadata;

		for (AttributeMetadata readerMetadata : attributes) {

			writerMetadata.push_back({readerMetadata.getAttributeName(), relationalWriter->toTypeId(readerMetadata.getTypeName())});

		}

		return writerMetadata;

	}

public:

	InferTypesHandler(shared_ptr<writer::RelationalWriter> relationalWriter, Configuration configuration) : relationalWriter(relationalWriter), configuration(configuration) {

	}

	void startRelation(string_t name, vector<AttributeMetadata> attributes) override {

		// TODO: move this logic to relpipe-lib-infertypes and share with certain modules like relpipe-in-csv

		for (RelationConfiguration rc : configuration.relationConfigurations) {

			if (std::regex_match(name, rc.relationPattern)) {

				if (rc.mode == MODE::METADATA || rc.mode == MODE::AUTO && MetadataMode::willInfer(attributes)) currentMode.reset(new MetadataMode(relationalWriter));

				else if (rc.mode == MODE::DATA) currentMode.reset(new DataMode(relationalWriter));

				else throw std::logic_error("Unsupported mode: " + std::to_string((int) rc.mode));

				break;

			}

		}

		if (currentMode) currentMode->startRelation(name, attributes);

		else relationalWriter->startRelation(name, toWriterMetadata(attributes), true);

	}

	void attribute(const string_t& value) override {

		if (currentMode) currentMode->attribute(value);

		else relationalWriter->writeAttribute(value);

	}

	void endOfPipe() {

		currentMode.reset();

	}

};

}

}

}